Auto merge of #22541 - Manishearth:rollup, r=Gankro 1.0.0-alpha.2

Continued from #22520

37 files changed, 108 insertions, 58 deletions

diff --git a/src/test/auxiliary/coherence-orphan-lib.rs b/src/test/auxiliary/coherence-orphan-lib.rs
index 2e5d18b58f2..cc42b288e66 100644
--- a/src/test/auxiliary/coherence-orphan-lib.rs
+++ b/src/test/auxiliary/coherence-orphan-lib.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait TheTrait<T> {
+pub trait TheTrait<T> : ::std::marker::PhantomFn<T> {
     fn the_fn(&self);
 }
 
diff --git a/src/test/auxiliary/default_type_params_xc.rs b/src/test/auxiliary/default_type_params_xc.rs
index d12f716decf..0a65174911e 100644
--- a/src/test/auxiliary/default_type_params_xc.rs
+++ b/src/test/auxiliary/default_type_params_xc.rs
@@ -12,4 +12,5 @@ pub struct Heap;
 
 pub struct FakeHeap;
 
-pub struct FakeVec<T, A = FakeHeap>;
+pub struct FakeVec<T, A = FakeHeap> { pub f: Option<(T,A)> }
+
diff --git a/src/test/auxiliary/inner_static.rs b/src/test/auxiliary/inner_static.rs
index 94acea06618..ca5c6072cb3 100644
--- a/src/test/auxiliary/inner_static.rs
+++ b/src/test/auxiliary/inner_static.rs
@@ -8,11 +8,11 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub struct A<T>;
-pub struct B<T>;
+pub struct A<T> { pub v: T }
+pub struct B<T> { pub v: T }
 
 pub mod test {
-    pub struct A<T>;
+    pub struct A<T> { pub v: T }
 
     impl<T> A<T> {
         pub fn foo(&self) -> int {
@@ -52,9 +52,9 @@ impl<T> B<T> {
 }
 
 pub fn foo() -> int {
-    let a = A::<()>;
-    let b = B::<()>;
-    let c = test::A::<()>;
+    let a = A { v: () };
+    let b = B { v: () };
+    let c = test::A { v: () };
     return a.foo() + a.bar() +
            b.foo() + b.bar() +
            c.foo() + c.bar();
diff --git a/src/test/auxiliary/issue-14421.rs b/src/test/auxiliary/issue-14421.rs
index 7c69cba179c..a48088609f9 100644
--- a/src/test/auxiliary/issue-14421.rs
+++ b/src/test/auxiliary/issue-14421.rs
@@ -10,6 +10,7 @@
 
 #![crate_type="lib"]
 #![deny(warnings)]
+#![allow(dead_code)]
 
 pub use src::aliases::B;
 pub use src::hidden_core::make;
@@ -23,9 +24,9 @@ mod src {
     pub mod hidden_core {
         use super::aliases::B;
 
-        pub struct A<T>;
+        pub struct A<T> { t: T }
 
-        pub fn make() -> B { A }
+        pub fn make() -> B { A { t: 1.0 } }
 
         impl<T> A<T> {
             pub fn foo(&mut self) { println!("called foo"); }
diff --git a/src/test/auxiliary/issue-16643.rs b/src/test/auxiliary/issue-16643.rs
index c5b3fceaf4a..b590160a0c2 100644
--- a/src/test/auxiliary/issue-16643.rs
+++ b/src/test/auxiliary/issue-16643.rs
@@ -10,7 +10,7 @@
 
 #![crate_type = "lib"]
 
-pub struct TreeBuilder<H>;
+pub struct TreeBuilder<H> { pub h: H }
 
 impl<H> TreeBuilder<H> {
     pub fn process_token(&mut self) {
diff --git a/src/test/auxiliary/issue-17662.rs b/src/test/auxiliary/issue-17662.rs
index be10ca1dd8f..fb55a077005 100644
--- a/src/test/auxiliary/issue-17662.rs
+++ b/src/test/auxiliary/issue-17662.rs
@@ -11,7 +11,7 @@
 #![crate_type = "lib"]
 
 pub trait Foo<'a, T> {
-    fn foo(&self) -> T;
+    fn foo(&'a self) -> T;
 }
 
 pub fn foo<'a, T>(x: &'a Foo<'a, T>) -> T {
diff --git a/src/test/auxiliary/issue-2380.rs b/src/test/auxiliary/issue-2380.rs
index 8eb6cd6e263..96f33f97a69 100644
--- a/src/test/auxiliary/issue-2380.rs
+++ b/src/test/auxiliary/issue-2380.rs
@@ -14,7 +14,10 @@
 #![allow(unknown_features)]
 #![feature(box_syntax)]
 
-pub trait i<T> { }
+pub trait i<T>
+{
+    fn dummy(&self, t: T) -> T { panic!() }
+}
 
 pub fn f<T>() -> Box<i<T>+'static> {
     impl<T> i<T> for () { }
diff --git a/src/test/auxiliary/issue-2526.rs b/src/test/auxiliary/issue-2526.rs
index e3ce4e8f656..89b3b56121a 100644
--- a/src/test/auxiliary/issue-2526.rs
+++ b/src/test/auxiliary/issue-2526.rs
@@ -13,8 +13,11 @@
 
 #![feature(unsafe_destructor)]
 
+use std::marker;
+
 struct arc_destruct<T> {
-  _data: int,
+    _data: int,
+    _marker: marker::PhantomData<T>
 }
 
 #[unsafe_destructor]
@@ -24,7 +27,8 @@ impl<T: Sync> Drop for arc_destruct<T> {
 
 fn arc_destruct<T: Sync>(data: int) -> arc_destruct<T> {
     arc_destruct {
-        _data: data
+        _data: data,
+        _marker: marker::PhantomData
     }
 }
 
diff --git a/src/test/auxiliary/issue_20389.rs b/src/test/auxiliary/issue_20389.rs
index 7a378b06df9..4ce7e3079e3 100644
--- a/src/test/auxiliary/issue_20389.rs
+++ b/src/test/auxiliary/issue_20389.rs
@@ -10,4 +10,5 @@
 
 pub trait T {
     type C;
+    fn dummy(&self) { }
 }
diff --git a/src/test/auxiliary/issue_3907.rs b/src/test/auxiliary/issue_3907.rs
index 2e254e5431d..545e15fe166 100644
--- a/src/test/auxiliary/issue_3907.rs
+++ b/src/test/auxiliary/issue_3907.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait Foo {
+use std::marker::MarkerTrait;
+
+pub trait Foo : MarkerTrait {
     fn bar();
 }
 
diff --git a/src/test/auxiliary/issue_8401.rs b/src/test/auxiliary/issue_8401.rs
index 0831993119a..9006a5d1775 100644
--- a/src/test/auxiliary/issue_8401.rs
+++ b/src/test/auxiliary/issue_8401.rs
@@ -12,7 +12,9 @@
 
 use std::mem;
 
-trait A {}
+trait A {
+    fn dummy(&self) { }
+}
 struct B;
 impl A for B {}
 
diff --git a/src/test/auxiliary/issue_9123.rs b/src/test/auxiliary/issue_9123.rs
index 000cc100a12..4f2792aebcd 100644
--- a/src/test/auxiliary/issue_9123.rs
+++ b/src/test/auxiliary/issue_9123.rs
@@ -15,5 +15,6 @@ pub trait X {
         fn f() { }
         f();
     }
+    fn dummy(&self) { }
 }
 
diff --git a/src/test/auxiliary/lang-item-public.rs b/src/test/auxiliary/lang-item-public.rs
index 834667968c8..b9cc20b63cc 100644
--- a/src/test/auxiliary/lang-item-public.rs
+++ b/src/test/auxiliary/lang-item-public.rs
@@ -12,8 +12,12 @@
 #![no_std]
 #![feature(lang_items)]
 
+#[lang="phantom_fn"]
+pub trait PhantomFn<A:?Sized,R:?Sized=()> { }
+impl<A:?Sized, R:?Sized, U:?Sized> PhantomFn<A,R> for U { }
+
 #[lang="sized"]
-pub trait Sized {}
+pub trait Sized : PhantomFn<Self> {}
 
 #[lang="panic"]
 fn panic(_: &(&'static str, &'static str, uint)) -> ! { loop {} }
@@ -25,6 +29,8 @@ extern fn stack_exhausted() {}
 extern fn eh_personality() {}
 
 #[lang="copy"]
-pub trait Copy {}
+pub trait Copy : PhantomFn<Self> {
+    // Empty.
+}
 
 
diff --git a/src/test/auxiliary/lint_group_plugin_test.rs b/src/test/auxiliary/lint_group_plugin_test.rs
index 36b3091852b..e9d98889ff8 100644
--- a/src/test/auxiliary/lint_group_plugin_test.rs
+++ b/src/test/auxiliary/lint_group_plugin_test.rs
@@ -37,9 +37,9 @@ impl LintPass for Pass {
 
     fn check_item(&mut self, cx: &Context, it: &ast::Item) {
         let name = token::get_ident(it.ident);
-        if &name[] == "lintme" {
+        if &name[..] == "lintme" {
             cx.span_lint(TEST_LINT, it.span, "item is named 'lintme'");
-        } else if &name[] == "pleaselintme" {
+        } else if &name[..] == "pleaselintme" {
             cx.span_lint(PLEASE_LINT, it.span, "item is named 'pleaselintme'");
         }
     }
diff --git a/src/test/auxiliary/lint_plugin_test.rs b/src/test/auxiliary/lint_plugin_test.rs
index 9020bb7b0fb..ffb234f70c8 100644
--- a/src/test/auxiliary/lint_plugin_test.rs
+++ b/src/test/auxiliary/lint_plugin_test.rs
@@ -35,7 +35,7 @@ impl LintPass for Pass {
 
     fn check_item(&mut self, cx: &Context, it: &ast::Item) {
         let name = token::get_ident(it.ident);
-        if &name[] == "lintme" {
+        if &name[..] == "lintme" {
             cx.span_lint(TEST_LINT, it.span, "item is named 'lintme'");
         }
     }
diff --git a/src/test/auxiliary/lint_stability.rs b/src/test/auxiliary/lint_stability.rs
index 01b2b748ba9..fb535eb8336 100644
--- a/src/test/auxiliary/lint_stability.rs
+++ b/src/test/auxiliary/lint_stability.rs
@@ -96,7 +96,7 @@ pub trait Trait {
 impl Trait for MethodTester {}
 
 #[unstable(feature = "test_feature")]
-pub trait UnstableTrait {}
+pub trait UnstableTrait { fn dummy(&self) { } }
 
 #[stable(feature = "test_feature", since = "1.0.0")]
 #[deprecated(since = "1.0.0")]
diff --git a/src/test/auxiliary/nested_item.rs b/src/test/auxiliary/nested_item.rs
index 21784bda27a..fc1bea5a9fd 100644
--- a/src/test/auxiliary/nested_item.rs
+++ b/src/test/auxiliary/nested_item.rs
@@ -25,7 +25,7 @@ impl Foo {
 }
 
 // issue 8134
-pub struct Parser<T>;
+pub struct Parser<T>(T);
 impl<T: std::iter::Iterator<Item=char>> Parser<T> {
     fn in_doctype(&mut self) {
         static DOCTYPEPattern: [char; 6] = ['O', 'C', 'T', 'Y', 'P', 'E'];
diff --git a/src/test/auxiliary/orphan_check_diagnostics.rs b/src/test/auxiliary/orphan_check_diagnostics.rs
index 7647f159401..cf3e9903b5a 100644
--- a/src/test/auxiliary/orphan_check_diagnostics.rs
+++ b/src/test/auxiliary/orphan_check_diagnostics.rs
@@ -8,4 +8,4 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait RemoteTrait {}
+pub trait RemoteTrait { fn dummy(&self) { } }
diff --git a/src/test/auxiliary/overloaded_autoderef_xc.rs b/src/test/auxiliary/overloaded_autoderef_xc.rs
index caa9bbe5736..3c8cba13ae7 100644
--- a/src/test/auxiliary/overloaded_autoderef_xc.rs
+++ b/src/test/auxiliary/overloaded_autoderef_xc.rs
@@ -11,7 +11,8 @@
 use std::ops::Deref;
 
 struct DerefWithHelper<H, T> {
-    pub helper: H
+    pub helper: H,
+    pub value: Option<T>
 }
 
 trait Helper<T> {
@@ -34,6 +35,6 @@ impl<T, H: Helper<T>> Deref for DerefWithHelper<H, T> {
 
 // Test cross-crate autoderef + vtable.
 pub fn check<T: PartialEq>(x: T, y: T) -> bool {
-    let d: DerefWithHelper<Option<T>, T> = DerefWithHelper { helper: Some(x) };
+    let d: DerefWithHelper<Option<T>, T> = DerefWithHelper { helper: Some(x), value: None };
     d.eq(&y)
 }
diff --git a/src/test/auxiliary/plugin_args.rs b/src/test/auxiliary/plugin_args.rs
index 907d80b50db..d0ab944813a 100644
--- a/src/test/auxiliary/plugin_args.rs
+++ b/src/test/auxiliary/plugin_args.rs
@@ -37,7 +37,7 @@ impl TTMacroExpander for Expander {
                    _: &[ast::TokenTree]) -> Box<MacResult+'cx> {
         let args = self.args.iter().map(|i| pprust::meta_item_to_string(&*i))
             .collect::<Vec<_>>().connect(", ");
-        let interned = token::intern_and_get_ident(&args[]);
+        let interned = token::intern_and_get_ident(&args[..]);
         MacExpr::new(ecx.expr_str(sp, interned))
     }
 }
diff --git a/src/test/auxiliary/private_trait_xc.rs b/src/test/auxiliary/private_trait_xc.rs
index 37ee10c8d37..42691579491 100644
--- a/src/test/auxiliary/private_trait_xc.rs
+++ b/src/test/auxiliary/private_trait_xc.rs
@@ -8,4 +8,4 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-trait Foo {}
+trait Foo : ::std::marker::MarkerTrait {}
diff --git a/src/test/auxiliary/svh-a-base.rs b/src/test/auxiliary/svh-a-base.rs
index 12833daf604..04f1062c16f 100644
--- a/src/test/auxiliary/svh-a-base.rs
+++ b/src/test/auxiliary/svh-a-base.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-lit.rs b/src/test/auxiliary/svh-a-change-lit.rs
index 9e74bf28135..fabd2289e9a 100644
--- a/src/test/auxiliary/svh-a-change-lit.rs
+++ b/src/test/auxiliary/svh-a-change-lit.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-significant-cfg.rs b/src/test/auxiliary/svh-a-change-significant-cfg.rs
index c900550041b..3fdb861bd40 100644
--- a/src/test/auxiliary/svh-a-change-significant-cfg.rs
+++ b/src/test/auxiliary/svh-a-change-significant-cfg.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-trait-bound.rs b/src/test/auxiliary/svh-a-change-trait-bound.rs
index 04f8eb3cf9b..3116d24673d 100644
--- a/src/test/auxiliary/svh-a-change-trait-bound.rs
+++ b/src/test/auxiliary/svh-a-change-trait-bound.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-type-arg.rs b/src/test/auxiliary/svh-a-change-type-arg.rs
index c7e0a18768a..b49a1533628 100644
--- a/src/test/auxiliary/svh-a-change-type-arg.rs
+++ b/src/test/auxiliary/svh-a-change-type-arg.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-type-ret.rs b/src/test/auxiliary/svh-a-change-type-ret.rs
index 5100af32318..6562a93135f 100644
--- a/src/test/auxiliary/svh-a-change-type-ret.rs
+++ b/src/test/auxiliary/svh-a-change-type-ret.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-change-type-static.rs b/src/test/auxiliary/svh-a-change-type-static.rs
index 077c33cb90d..c7b392c6ee8 100644
--- a/src/test/auxiliary/svh-a-change-type-static.rs
+++ b/src/test/auxiliary/svh-a-change-type-static.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-comment.rs b/src/test/auxiliary/svh-a-comment.rs
index d481fa5a1fa..450f6102026 100644
--- a/src/test/auxiliary/svh-a-comment.rs
+++ b/src/test/auxiliary/svh-a-comment.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-doc.rs b/src/test/auxiliary/svh-a-doc.rs
index 9e99a355ac1..c000737c854 100644
--- a/src/test/auxiliary/svh-a-doc.rs
+++ b/src/test/auxiliary/svh-a-doc.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-macro.rs b/src/test/auxiliary/svh-a-macro.rs
index b8dd497ac99..1e12659dc4b 100644
--- a/src/test/auxiliary/svh-a-macro.rs
+++ b/src/test/auxiliary/svh-a-macro.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-no-change.rs b/src/test/auxiliary/svh-a-no-change.rs
index 12833daf604..04f1062c16f 100644
--- a/src/test/auxiliary/svh-a-no-change.rs
+++ b/src/test/auxiliary/svh-a-no-change.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-redundant-cfg.rs b/src/test/auxiliary/svh-a-redundant-cfg.rs
index 690ddc670f5..1e82b74f1ef 100644
--- a/src/test/auxiliary/svh-a-redundant-cfg.rs
+++ b/src/test/auxiliary/svh-a-redundant-cfg.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/svh-a-whitespace.rs b/src/test/auxiliary/svh-a-whitespace.rs
index 216e8e997f2..3c3dac9cdab 100644
--- a/src/test/auxiliary/svh-a-whitespace.rs
+++ b/src/test/auxiliary/svh-a-whitespace.rs
@@ -15,12 +15,14 @@
 
 #![crate_name = "a"]
 
+use std::marker::MarkerTrait;
+
 macro_rules! three {
     () => { 3 }
 }
 
-pub trait U {}
-pub trait V {}
+pub trait U : MarkerTrait {}
+pub trait V : MarkerTrait {}
 impl U for () {}
 impl V for () {}
 
diff --git a/src/test/auxiliary/trait_bounds_on_structs_and_enums_xc.rs b/src/test/auxiliary/trait_bounds_on_structs_and_enums_xc.rs
index 1695e474de9..a7c469fccaa 100644
--- a/src/test/auxiliary/trait_bounds_on_structs_and_enums_xc.rs
+++ b/src/test/auxiliary/trait_bounds_on_structs_and_enums_xc.rs
@@ -8,7 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait Trait {}
+pub trait Trait {
+    fn dummy(&self) { }
+}
 
 pub struct Foo<T:Trait> {
     pub x: T,
diff --git a/src/test/auxiliary/trait_impl_conflict.rs b/src/test/auxiliary/trait_impl_conflict.rs
index 990bc216049..0982efbdbf4 100644
--- a/src/test/auxiliary/trait_impl_conflict.rs
+++ b/src/test/auxiliary/trait_impl_conflict.rs
@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub trait Foo {
+pub trait Foo : ::std::marker::MarkerTrait {
 }
 
 impl Foo for int {
diff --git a/src/test/auxiliary/use_from_trait_xc.rs b/src/test/auxiliary/use_from_trait_xc.rs
index 22e0d3168ca..56fb40bc0a4 100644
--- a/src/test/auxiliary/use_from_trait_xc.rs
+++ b/src/test/auxiliary/use_from_trait_xc.rs
@@ -11,7 +11,7 @@
 pub use self::sub::{Bar, Baz};
 
 pub trait Trait {
-    fn foo();
+    fn foo(&self);
 }
 
 struct Foo;